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AI Writing Comparison

Copy.ai vs. LanguageTool

At a glance

At a glance

Copy.ai

Best for

Best for sales and marketing teams running outbound and short-form copy at scale.

  • Freelancers
  • Small and mid-sized
  • Enterprise

LanguageTool

Best for

Best for writers and teams working in several languages who want the same checker inside their browser, office suite and mail client.

  • Freelancers
  • Small and mid-sized
  • Enterprise

Cataleo does not name a winner. Both statements come from the vendors themselves.

Full Comparison

Criterion Copy.ai LanguageTool
Starting price Free tier; Pro from ~$49 / month Pricing was recently restructured, check the current figure with the vendor. Free tier Premium is billed monthly, quarterly, annually or for two years; Teams is priced per user for 2 to 1,000 or more users.
Free trial Free tier with around 2,000 words per month Free tier
Commercial use Yes Not stated
Output Marketing and sales copy, plus go-to-market automation Spelling, grammar, punctuation and style corrections, plus AI paraphrased sentences
API Yes Yes, the Proofreading HTTP API in monthly tiers from 100 to 10,000 requests, up to 60,000 characters per request
Languages Not stated More than 30 languages and dialects, with six English varieties
Hosting Not stated Cloud (SaaS), API servers in Germany; the source code is published for self-hosting
Content types Marketing and sales copy Checks and rewrites text the writer has already started rather than generating a content format; Premium raises the limit to 150,000 characters per text field, which covers blog articles, letters and long e-mails
Brand voice Yes, Brand Voice keeps outputs aligned to a company's style Yes, a Style Guide of custom rules for consistent wording, and a shared Team Style Guide plus a Team Dictionary of technical terms on the Teams plan
Content scoring No content performance scoring No content or readability score. The editor's Statistics view tracks writing activity over time, the languages used, the errors made and the suggestions applied, which measures the writer's habits rather than rating a piece of text
Drafting tools Yes, chat, actions and workflow-driven generation Yes, an AI paraphrasing tool that rewrites a sentence to be more formal, more fluid or shorter, uncapped on Premium
Templates Yes, large template library No content templates. LanguageTool corrects and rephrases text the writer brings to it; the only things reusable across documents are the personal dictionary and the Style Guide rules
Team workflows Yes, go-to-market workflow automation Yes, the Teams plan adds e-mail invitations, user management, a shared style guide and a shared dictionary for 2 to 1,000 or more users
Deployment Cloud (SaaS), Browser-based Cloud (SaaS), Browser-based
Onboarding Not stated Documentation and knowledge base
Company size Freelancers, Small and mid-sized, Enterprise Freelancers, Small and mid-sized, Enterprise
Integrations Not stated Chrome, Microsoft Edge, Mozilla Firefox, Opera, Google Docs, Microsoft Word, Apple Pages, LibreOffice, Gmail, Outlook, Apple Mail, Thunderbird, macOS, Windows

Compare more tools

Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.

The short version

Key Differences

  • Starting price Copy.ai Free tier; Pro from ~$49 / month LanguageTool Free tier
  • Free trial Copy.ai Free tier with around 2,000 words per month LanguageTool Free tier
  • Output Copy.ai Marketing and sales copy, plus go-to-market automation LanguageTool Spelling, grammar, punctuation and style corrections, plus AI paraphrased sentences
  • API Copy.ai Yes LanguageTool Yes, the Proofreading HTTP API in monthly tiers from 100 to 10,000 requests, up to 60,000 characters per request
  • Content types Copy.ai Marketing and sales copy LanguageTool Checks and rewrites text the writer has already started rather than generating a content format; Premium raises the limit to 150,000 characters per text field, which covers blog articles, letters and long e-mails

Every line is one datapoint from the table above, picked automatically. Nothing here is written text.

The trade-offs

Strengths and Limitations

Copy.ai

Strengths

  • Genuinely useful free tier
  • Broad template library
  • Strong for sales and go-to-market automation

Limitations

  • Pricing was recently restructured, verify the live page
  • Less brand voice depth than Jasper

LanguageTool

Strengths

  • More than 30 languages and dialects in one checker
  • Add-ons for browsers, Google Docs, Word, Apple Pages, LibreOffice, four mail clients and desktop apps
  • Proofreading HTTP API served from Germany, with no storage of submitted text
  • Source code published, so the checker can be run on your own server

Limitations

  • The free tier caps the length of a single text field
  • The extra Premium checks cover seven languages, not all thirty
  • No editor of its own; the checker lives in add-ons and plugins

Plans

Pricing

Copy.ai

  • Free $0 Around 2,000 words per month.
  • Pro ~$49 Per month. Pricing was recently restructured, check the current figure with the vendor.
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LanguageTool

  • Free $0 Basic spelling, grammar and punctuation checking with a limit on the length of a single text field.
  • Premium Not stated More than 20,000 additional checks, up to 150,000 characters per text field, unlimited AI paraphrasing and a Style Guide. Billed monthly, quarterly, annually or for two years.
  • Teams Not stated All Premium features plus user management, a Team Style Guide and a Team Dictionary, priced per user for 2 to 1,000 or more users.
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What users say

Review Scores · opens after launch

Copy.ai

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

LanguageTool

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Where this comes from

Where this comes from

Copy.ai https://www.copy.ai · no check date recorded yet

LanguageTool https://languagetool.org · checked against the official source on 2026-09-09

This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.